What Are The Biggest Elgg-based SITES

This is to replace my earlier post.. the ("quantum") singularity of the language has been revised.. It will be interesting to exchange experiences and issues and "scalability" aspects related to implementing Elgg or social networking sites beyond the hobbyist $4/mth ISP level to those levels where one just has to be thinking $500 - $1000 / month dedicated. We ourselves have much data from our experience which we can "share" for the community.